Lathe for turning cross-head pins



(No Model.) I 2 Sheets-Sheet 1.

2 N. THOMAS. LATHE FOR TURNING CROSS HEAD PINS. v 7 No. 322,212. Pate ntedJuly 14, 1885.

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N.- THOMAS.

LATHE FOR TURNING GROSS HEAD PINS. No. 322,212. Patented July 14, 1885..

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upon legs or standards/2, carries at its oppo- NITED STATES NICHOLASTHOMAS, 0

ATENT OFFICE.

F CHICAGO, ILLINOIS.

LATHE FOR TURNING CROSS-HEAD PINS.

fiPECIPICATION forming part of Letters Patent No. 322,212, dated July14,1885.

, Application filed May To aZZ whom it may concern.-

Be it known that I, NICHOLAS THOMAS, of Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Lathes for Turning Cross- Head Pins, 8rd, of which improvements thefollowing is a specification. I

The object of my invention is to provide effective and esirable meanswhich may be rgadily appl-iedaolathesoiltjggprdinary cons'truc" ion forturning the pins ofbross-heads or other articles, which, by reason oftheir/relation to other parts of the structure with which they areconnected, cannot be turned in lathes in the operation of which thespindle and the work carried thereby are continuously rotated.

To this end my improvements consistin certain novel devices andcombinations, hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a View in perspective of alathe embodying my invention; Fig. 2, a side view in elevation of thesame; Fig. 3, a plali or top View; Fig. 4, an end view as seen from theleft; and Fig. 5, an end view as seen from-the right, with thetail-stock removed and the piece of work operated on shown in verticalsection.

My improvements are herein illustrated as applied in a back-geared lathewhich is otherwise of the present standard construction. The lathe bedor shears 1, which is supported site ends a head-stock, 3, and atail-stock, 4E. The live-spindle 5 is mounted in bearings in thehead-stockS/and a cone or stepped pu-lley, 6, to which isisecured apinion, 7 is fitted to rotate freely upon said spindle; The pinion 7meshes with a gear, 8, fixed upon the back gear-shaft,9, which carries apinion, 10, said pinion being adapted either to mesh with a gear, 11,fixed upon the spindle 5, when it is desired to rotate said spindlecontinuously to operate the lathe in the ordinary manner, or to engageanother gear, 12, and through the same and its connections to impart anoscillatory or partially rotativ e ypyenient to the spindle for theperfdifinanee of the class of work for which myimprovements aredesigned,

22, 1885. (No model.)

pinion ld is fitted to slide longitudinally upon face-plate 16 of thelathe, and a diametric slot,

17, is formedin the disk 15toreceive1a crankpin, I g which may beadjusted and fixed in positlon in said slot at such distance from thecenter of the shaft 13 as may be necessary to impart the degree ofoscillatorymovement to the live spindle 5 which is'required by thecharacter of the wdrk to be performed. A connecting-rod, 19, is coupledto the crank-pin 1 8 and to a wiist-pin 2Q, upon a segmental gear, 21,pivoted by a p'iiibr stud, 22, to the head-stock 3. The gear 21 mesheswith apinion, 23, secured upon the spindle 5, and,when vibrated oroscillated by the connecting-rod 19 about the center of its pivot 22,imparts a corresponding vibratory or oscillatory movement to the spindle5 and the Work carried upon the face-plate 16 thereof, the degree ofsuch movement being regulated by the adj ustment of the crank-pin 18 inthe slot 17 0f the disk 15.

It will be obvious that in lieu of employing asegmental gear, asdescribed and shownin Figs. 2 to 5, a circular gear adapted to oscillateabout its center, as shown in Fig. 1, maybe used with similar effect;but I deem the construction first referred to more convenient anddesirablef The saddle or carriage 24 is fitted to slide longitudinallyupon the bed 1 in the usual manner, and is moved by a feedscrew, 25,actuated intermittently by a ratchet attachment similar to that of aplaning-machine, the feed-screw carrying a ratchet-pinion, 26, which isengaged by pawls 27, which are swung about a center by a connecting-rod,28, coupled to a crank-disk, 29, on the spindle 5. The ordinary lathefeed gear may be readily substituted when a continuous feed is desiredfor performing the usual work of a p lathe.

The cross-head 30, or other piece of work to as presently to bedescribed. To this end the be operated on, may be chucked on thefaceplate or supported between the live and dead centers 31 32 in theordinary manner, andtwo tools or cutters, 33, are by preferenceemployed, said tools being secured in tool-posts 34', each of which isfixed in a slide-block, 35, hung to the saddle, as in a planer, so thatthe tool may lift from its work when the traverse of the work isreversed. Each of the slideblocks 35 is operated by an independent crossfeed-screw, 36, having either a right or left hand thread, and carryinga pinion, 37, one or both of said pinions,being fitted to slidelongitudinally upon its feed-screw, so that the tools may be setindependently one of the other. After setting the tools,the pinions areslipped into gear with each other, and the two tools will then be causedto simultaneously advance to or recede from the center line of thespindle. It will be seen that this construction is advantageouslyapplicable in facilitating the employment of two tools in any class ofwork on an ordinary lathe.

In the operation of the lathe in turning up a cross-head pin, thecrank-pin 18 being adjusted to effect the desired amountof traverse, andthe piece of work to be operated on being chucked on the face-plate orsecured between the centers 31 a fiat spot is formed on the cross-headpin other member to be turned for the commencement of the cut of one ofthe tools, which is set, and a half-revolution of the spindle made.'lhbthbftbol'fi thenset exactly simil'anto the first, and the pinions 37placed in gear, upon which the tools will be simultaneously operated,and will out alternately, each turning one-half of the circumference ofthe pin as the same is vibrated about its center by the connecting-rod19, so that no time is lost and the cuts of the t wo tools join to makea true circle.

WVhen it is desired to use the lathe in the ordinary manner, thesegmental gear is disconnected, the pinion 10 moved into engagement withthe gear 11, and the usual lathe-feed substituted for that shown, thetwo posts being retained, or a single tool-holder employed, as may bedesired. 1

While the employment of the intermediate gears, 21 23, for transmittingmovement t'o the spindle from the connecting-rod may in most cases befound desirable, the same is not essential, and said gears can under myinvention be dispensed with, and the connectingrod be coupled directlyto the face-plate or spindle.

I claim as my invention and desire to secure by Letters Patent- 1. Thecombination of a lathespindle, a crank-shaft fitted to rotate inbearings in the head-stock or supporting-head of said spindle, and anintermediate connection whereby vibratory movement is imparted to thespindle from the crank-shaft, substantially as and for the purpose setforth.

2. The combination of a lathe -spindle, a crank-shaft mounted on theheadstock or supporting-head of said spindle, a gear adapted to vibrateabout an axis on the head-stock, a connecting-rod coupled to a pin onthe crankshaft and to said gear, and a pinion secured upon the spindleand meshing with said gear, substantially as set forth.

3. The combination of a lathe-spindle, a cone-pulley fitting freelythereon, a crankshaft mounted in bearings in the head-stock orsupportinghead of the spindle, gearing for rotating said shaft from thecone-pulley, a gear adapted to vibrate about an axis on the head-stock,a connecting-rod coupled to a pin on the crank -shaft and to said gear,and a pin ion secured upon the spindle and meshing with said gear,substantially as set forth.

4. The combination of a lathespindle, a cone-pulley fitting freelythereon, a back gearshaft and a supplemental crank-shaft, each mountedin bearings on the head-stock or supporting-head of the spindle, gearingfor rotating the back gear-shaft from the cone-pulley, a pinion fittedto slide longitudinally on the back gearshaft and to engage either agear on the crank-shaft or a gear fixed upon the spindle, a gear adaptedto vibrate about an axis on the head stock, a connecting rod coupled toa pin on the crank-shaft and to said gear, and a pinion secured upon thespindle and meshing with said gear, substantially as set forth.

5. The combination of a lathe-spindle, a lathe carriage or saddle, twotools or cutters, each mounted in an independent slide-block on thecarriage, two feed-screws, each governing the movement of one of saidslide-blocks toward and from the center line of the spindle, and twopinions, each mounted upon one of said feed-screws, either of saidpinions being fitted to slide longitudinally upon its feedscrew, so'thatsaid pinions may beiengaged or disengaged to enable either coincident orindependent movement of the slide-blocks and tools to be effected,substantially as set forth.

NICHOLAS THOMAS.

WVitnesses:

N. J. BASSETT, M. E. WHITE.

IIO

